Shafiei F, et al. - Experts ascertained if applying 4 different liners under short fiber-reinforced composite (SFRC), everX Posterior, vs conventional composite resin, Z250, affected their strengthening property in premolar mesio-occluso-distal (MOD) cavities. Results demonstrated that compared to conventional composite resins the 4 liners could be used without interfering with the higher efficacy of SFRC to improve the fracture strength of premolar MOD cavities. For both composite resins, application of SARC and SAFL liners led to a higher number of restorable fractures.